I have several rooms to paint. Painting kitchen at present. My problem is although I am a neat painter, prep the walls properly and take my time at the job. I do not seem to be able to get a good clean finish when 'cutting in' at wall/ceiling. Any recommendations as to what cutting in brush is best? Is there a tip for perhaps thinning the paint etc.? What do you recommend as to the order of work should you do the cutting in first and the rollering neatly to meet up? I have to DIY as there are budget constraints. I would really want to get a nice clean finish. Thanks.